小弟25日下午1点从长春去吉林温泉，当天北方普遍大雪，打电话给高管局得知长吉高速开通担有少量积雪。长春一直飘着小雪花，2点上了高速，前半段路况还行，融雪剂起了作用，越靠近吉林雪越大，最后10公里几乎都暴雪狂风了，能见度绝对不超过50米，打着双闪跟住前车开到目的地。马上打电话给单位同事告知他们路况危险。我另一个同时下午4点走同样路线，打电话给高管局，同样告知路通有积雪，他说他走的时候天都黑了，靠近吉林的时候雪更大，能见度更差。路况太危险了

我想知道，到底什么情况下高速公路才封闭？以25日那样的情景，是绝对不适合通车的

不过国内大部分公路没有相应的设备，司机也没有培训，大雪会造成很多车辆出问题的。

加拿大估计一次降雪超过半米，公路就要封闭了，因为铲雪车都开不动了，比如月初的安省中部，一星期降雪超过了1米，好几个市镇的道路全部封闭。还有前几年在东部省份，一次降雪95厘米，※※呼吁在路上驾车的民众到就近的民居寻求避护。

如果正下大雪来不及扫的时候，北加州主干道80号也时常会关闭。

看实时画面
http://video.dot.ca.gov/asx/d3-truckee-scales-80.asx

加州并不是到处都是四季阳光灿烂的，好几条翻越内华达-西岳腊山脉的公路要冬季要关闭好几个月。滑雪场的积雪厚度会有10几20米。

比如89：

This highway information is the latest reported as of Tuesday, December 29, 2009 at 22:53 .

SR 89
    [IN THE CENTRAL CALIFORNIA AREA & SIERRA NEVADA]
    IS CLOSED FROM THE JCT OF US 395 (MONO CO) TO THE JCT OF SR 4
/MONITOR PASS/ (ALPINE CO) - FOR THE WINTER - MOTORISTS ARE ADVISED TO USE AN
ALTERNATE ROUTE

    CHAINS ARE REQUIRED ON ALL VEHICLES EXCEPT 4-WHEEL-DRIVE VEHICLES WITH SNOW
TIRES ON ALL 4 WHEELS FROM PICKETTS JCT (ALPINE CO) TO 2.7 MI SOUTH OF THE
JCT OF US 50 (EL DORADO CO) /LUTHER PASS/

    [IN THE NORTHERN CALIFORNIA AREA]
    IS CLOSED FROM THE SOUTH PARK BDRY TO THE JCT OF SR 44 /LASSEN LOOP/
(TEHAMA, SHASTA CO) - FOR THE WINTER - MOTORISTS ARE ADVISED TO USE AN
ALTERNATE ROUTE

    CHAINS ARE REQUIRED ON ALL VEHICLES EXCEPT 4-WHEEL-DRIVE VEHICLES WITH SNOW
TIRES ON ALL 4 WHEELS FROM PICKETTS JCT (ALPINE CO) TO 2.7 MI SOUTH OF THE
JCT OF US 50 (EL DORADO CO) /LUTHER PASS/

    CHAINS OR SNOW TIRES ARE REQUIRED FROM 5 MI NORTH OF THE JCT OF US 50
TO BLISS STATE PARK (EL DORADO CO)

    CHAINS ARE REQUIRED ON ALL VEHICLES EXCEPT 4-WHEEL-DRIVE VEHICLES WITH SNOW
TIRES ON ALL 4 WHEELS FROM BLISS STATE PARK 2 MI NORTH OF BLISS STATE PARK
(EL DORADO CO)

    CHAINS OR SNOW TIRES ARE REQUIRED FROM 2 MI NORTH OF BLISS STATE PARK
TO THE JCT OF I 80 (NEVADA CO)

    CHAINS OR SNOW TIRES ARE REQUIRED FROM 4 MI NORTH OF TRUCKEE (NEVADA CO)
TO THE SIERRA/PLUMAS CO LINE

    CHAINS OR SNOW TIRES ARE REQUIRED FROM GRAEAGLE TO CANYON DAM (PLUMAS CO)
   
    CHAINS ARE REQUIRED ON SINGLE AXLE DRIVE VEHICLES TOWING TRAILERS FROM
13 MI NORTH OF THE JCT OF SR 299 (SHASTA CO) TO 1.5 MI SOUTH OF BARTLE
(SISKIYOU CO) /DEAD HORSE SUMMIT/

    CHAINS ARE REQUIRED ON ALL VEHICLES EXCEPT 4-WHEEL-DRIVE VEHICLES WITH SNOW
TIRES ON ALL 4 WHEELS FROM MCCLOUD TO 0.5 MI SOUTH OF THE JCT OF I 5
(SISKIYOU CO) /MCCLOUD SUMMIT/

俺觉得动不动就封路是管理部门不愿意负责任的表现。

加州要达到R3的级别，只能等到The Day After Tomorrow了。

加州公路局的标准：

    * R1: Chains are required - snow tread tires allowed.
R1: 要上雪链，雪胎可以例外。
    * R2: Chains are required on all vehicles except four wheel drive vehicles with snow tires on all four wheels.
R2：除四驱雪胎外，其他全部要打雪链；
    * R3: Chains are required - all vehicles - no exceptions.
R3：全部要打雪链，没有例外。

    * R1 and R2 are the most common conditions. The highway is usually closed before an R3 condition is imposed.
高速通常在R3之前关闭。

在枫叶国多大都不会封闭，除非有严重事故，比如上个星期渥太华附近有62辆车冲路面，封闭了几个小时清理事故现场，庆幸的是没有人严重受伤。

[balteeno 编辑于 2009-12-29 03:17]

多大都不应该封，除非出现了车祸堵车

一般这样小雪时候，主路不封闭，沿途的可能上不了高速。

下雾时候也是，记得前年，会有警车40KM时速开路，带30个车半小时出发一趟。

基本上只要有道眼就不会封路，如果有冰就不行了，雪没事

大雪过后坐1041卡车走高速从长春到沈阳的飘过。
沈阳职业老司机，80KM/h速度雪上狂奔。一路见到多起事故。

一晃儿十年前的事了。